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Why is back up far smaller than file on computer?

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EastTenn
EastTenn
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Following a tip I got on this forum, I have backed up Thunderbird to a flash drive for years.

Last night, my flash drive showed only 23.7 GB after the backup while the properties of the original data file showed 31.2 GB. What is going on?

We recently got Windows 11 not really by choice. Could this be the issue? I do NOT keep all email. I just keep a lot and it has mounted up over the years.

I do not want to lose 7.5 GB of email messages as one of those might be needed. The back up took almost an hour. That also is not normal.

Following a tip I got on this forum, I have backed up Thunderbird to a flash drive for years. Last night, my flash drive showed only 23.7 GB after the backup while the properties of the original data file showed 31.2 GB. What is going on? We recently got Windows 11 not really by choice. Could this be the issue? I do NOT keep all email. I just keep a lot and it has mounted up over the years. I do not want to lose 7.5 GB of email messages as one of those might be needed. The back up took almost an hour. That also is not normal.

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